Schedule of Activity Costs Quality Control Activities Activity Cost Process audits $48,200 Training of machine operators 27,800 Processing returned products 19,000 Scrap processing (disposal) 24,900 Rework 6,900 Preventative maintenance 31,800 Product design 2,600 Warranty work 8,700 Finished goods inspection 23,600 From the provided schedule of activity costs, determine the prevention costs Oa. $100,200 Ob. $59,600 Oc. $119,200 Od. $107,100